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the fr9838 is a dual-channel synchronous step-down dc/dc converter that provides wide 4.5v to 36v input voltage range and 5a load current capability. it is providing solutions for car charger, smart power strip and portable charger. the fr9838 operates in either cv (constant voltage) or cc (constant current) mode.

the fr9838 can be applied to single output or dual output and provide a programmable cc threshold for current limitation. at light load condition, the fr9838 can operate at power saving mode to support high efficiency and reduce power loss.

the fr9838 fault protection includes cycle-by-cycle current limit, short circuit protection, uvlo and thermal shutdown. the soft-start function prevents inrush current at turn-on. this device uses current mode control scheme which provides fast transient response. internal compensation function reduces external compensatory components and simplifies the design process. in shutdown mode, the supply current is about 1ma.

the fr9838 is offered in tdfn-10l (5mm x 6mm) package, which provides good thermal conductance.

• wide input voltage range: 4.5v to 36v
• adjustable output voltage down to 0.8v
• 5a output current
• 130khz switching frequency
• dual channel cc/cv mode control
• <1ma shutdown current
• internal 3ms soft-start
• internal compensation function
• cycle-by-cycle current limit
• hiccup short circuit protection
• input under voltage lockout
• input over voltage protection
• cable voltage drop compensation
• over-temperature protection with auto recovery
• output voltage thermal regulation
• tdfn-10l (5mm x 6mm) package